Sixteen year old Penny Francone is accused of being a murderer. She was found alone in the victim's apartment covered in the victim's blood and holding the murder weapon. The victim's identity and her relationship to Penny gives Penny the perfect motive for committing the crime. The only thing the jury will need to decide is where Penny will serve out her sentence. Will she be spending the rest of her life in a state mental hospital or a maximum security prison? Her mother, Grace, is still reeling from the sudden death of her husband and now she is grateful that Massachusetts doesn't allow the death penalty.
Penny is waiting for her trial to start in a mental hospital. She is being treated by Dr. Mitchell McHugh, a psychiatrist who is struggling with his own demons. Grace's determination to understand why her daughter murdered someone helps fuels Mitch's resolve to the family. They try to work together to find the truth behind that night and instead they discover secrets and lies that can tear them apart.